we'll have your official obama campaign response with the co-founder and former ceo of car max next. >>> and facebook marking a milestone, officially reaching 1 billion monthly active users. hear what facebook ceo mark zuckerberg has to say about leveraging that milestone in an nbc exclusive. >>> u.s. retailers coming in solid, eased up on big spending ahead of the holiday season. we'll sort through the numbers and give you the look ahead to the holidays. >>> first, the first presidential debate, as we said, now in the books. romney and obama facing off last night in their first presidential debate. among the topics they sparred over, revenue. take a listen. >> there has to be revenue in addition to cuts. now, governor romney has ruled out revenue. he's ruled out revenue. >> absolutely. look, the revenue i get is by more people working, getting higher pay, paying more taxes. that's how we get growth and how we balance the budget. but the idea of taxing people more, putting more people out of work, you'll never get there. >> for reaction from the obama campaign, the co-founder and for